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lib/Algorithm/Diff/HTMLTable.pm  view on Meta::CPAN

package Algorithm::Diff::HTMLTable;

# ABSTRACT: Show differences of a file as a HTML table

use strict;
use warnings;

use Algorithm::Diff;
use Carp;
use HTML::Entities;
use Time::Piece;

our $VERSION = '0.05';

sub new {
    my ($class, @param) = @_;

    return bless {@param}, $class;
}

sub diff {
    my $self = shift;

    croak "need two filenames" if @_ != 2;

    my %files;

    @files{qw/a b/} = @_;

    NAME:
    for my $name ( qw/a b/ ) {

        croak 'Need either filename or array reference' if ref $files{$name} && ref $files{$name} ne 'ARRAY';
        next NAME if ref $files{$name};

        croak $files{$name} . " is not a file" if !-f $files{$name};
        croak $files{$name} . " is not a readable file" if !-r $files{$name};
    }

    my $html = $self->_start_table( %files );
    $html   .= $self->_build_table( %files );
    $html   .= $self->_end_table( %files );

    return $html;
}

sub _start_table {
    my $self = shift;
    my %files = @_;

    my $old = $self->_file_info( $files{a}, 'old' );
    my $new = $self->_file_info( $files{b}, 'new' );
    
    my $id = defined $self->{id} ? qq~id="$self->{id}"~ : '';

    return qq~
        <table $id style="border: 1px solid;">
            <thead>
                <tr>
                    <th colspan="2"><span id="diff_old_info">$old</span></th>
                    <th colspan="2"><span id="diff_new_info">$new</span></th>
                </tr>
            </thead>
            <tbody>
    ~;
}

sub _build_table {
    my $self = shift;

    my %files = @_;

    my @seq_a = $self->_read_file( $files{a} );
    my @seq_b = $self->_read_file( $files{b} );

    my $diff = Algorithm::Diff->new( \@seq_a, \@seq_b );

    $diff->Base(1);

    my $rows = '';

    my ($line_nr_a, $line_nr_b) = (1, 1);
    while ( $diff->Next ) {
        if ( my $count = $diff->Same ) {
            for my $string ( $diff->Same ) {
                $rows .= $self->_add_tablerow(
                    line_nr_a => $line_nr_a++,
                    line_nr_b => $line_nr_b++,
                    line_a    => $string,
                    line_b    => $string,
                    color_a   => '',
                    color_b   => '',
                );
            }
        }
        elsif ( !$diff->Items(2) ) {
            my @items_1 = $diff->Items(1);
            my @items_2 = $diff->Items(2);
            
            my $max = @items_1 > @items_2 ? scalar( @items_1 ) : scalar( @items_2 );
            
            for my $index ( 1 .. $max ) {
                $rows .= $self->_add_tablerow(
                    line_nr_a => $line_nr_a++,
                    line_nr_b => '',
                    line_a    => $items_1[ $index - 1 ] // '',
                    line_b    => $items_2[ $index - 1 ] // '',